Looper mechanism for sewing-machines.



E. ERICKSON.

'LOOPER MECHANISM FOR SEWING M A CHINES.

APPLICATION FILED APR-24, 1915-.

LMQJHH. Patented Jan. 25, 1916.

THE COLUMBIA PLANOGRAPH c0., WASHINGTONL D. C.

TE SA 1. T@.

EDWARD ERICKSON, 0F LYNN, MASSACHUSETTS, ASSIGNGR TO VICTOR SHOEMACHINERY COMPANY, 015 BOSTON, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

LGOPER MECHANTSIVI FOR SEWING-MACHINES.

Specification of Letters Patent. Patented Jan. 25, 1916.

hpplication filed April 24, 1915. Serial M24137.

T 0 (ZZZ tchom'it may concern:

Be it known that I, EDWARD EnioKsoN, a subject of the King of Sweden,and a resident of Lynn, in the county of Essex and State ofMassachusetts, have invented cer tain new and useful Lnproven ients inLooper Mechanisms for Sewing-Machines, of which the following is aspecification.

This invention relates to looper mechanisms for sewing machines and hasfor its object the provision of a new device of this character in whichthe friction upon the various moving parts coacting with a revoluble cammember will be reduced to a minimum.

The invention consists in certain novel features of construceion andarrangement of parts which will be fully understood by reference to thedescription of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a sectional elevation of a portionof a sewing machine having applied thereto a looper mechanism embodyingthe principles of the present invention. Fig. 2 represents a frontelevation of said looper mechanism. Fig. 3 represents a side elevationof the same showing the supporting bearing in section. Fig. 1 representsa rear elevation of the same, and Fig. 5 represents a horizontal sectionthe cutting plane being on line 55 on Fig. 3.

Similar characters designate throughout the several figures drawings. v

In the drawings, 10 is a rev'o'luble shaft having keyed thereto a camdisk llhaving a peripheral cam throw 12 and a peripheral cam path 13.The cam path 13 is preferably concave and adapted to receive a largeball 1 mounted in a. raceway of a member 15, said raceway carrying aplurality of antitriction members such as the small balls 16 on whichsaid ball 141 is adapted to freely rotate. The raceway 15 is secured toone end of a lever 17 pivoted at 18 to the oscillating member 19. Theoscillating member 19 is provided with an arm JO-from which extends alug 20 adapted to support one end of a spring 21, the opposite end ofwhich is'positioned on a lug 22 projecting from an arm 23 having at oneend a roller 24 engaging the periphery of the cam disk 11 while theopposite end of said arm 23 is like parts 01 the provided with a sleeve25 surrounding a stud 25 formed upon the oscillating mcm her 19. Boththe stud 25 and the sleeve 25 are adapted to oscillate in the fixedbearing 26 forming a part of the main frame of the sewing machine. Thestud 25* is provided with a reduced threaded end 27 on which is mounteda nut 28 adapted to prevent the displacement of the oscillating member19 and the stud 25 from the sleeve 25 and its hearing 26. y

The arm 23 being interposed between the member 19 and the end of thebearing 26 is prevented from "endwise movement but is free to oscillateabout the axis of the sleeve 25 in its bearing '26. The spring 21interposed between the arms 20 and insures the ball 14; seating itselfin the path 13 and also causes the roller 24 to remain in contact withthe periphery of thedisk 11. The lever 17 is provided with tapered studs80 secured thereto by means of the nuts 81. The axes of these studs 30are parallel and said studs are disposed on. opposite sides of the ball14 with their outer and smaller ends opposite the center of said ball asshown in Fig. 5 'otthe drawings. These studs b0 prevent the ball 14 frombeing displaced from the raceway in the member 15 and the antii'rictionmembers 16 mounted therein. It will be observed from an inspection ofthe drawings that b v the construction shown therein the ball 14: isfree to move in any direction. N e V The cam disk 11 is provided with adeep reces's'32 in the bottom 01 the cam path 13, this recess ordepression 32 being adapted to receive the pit-ejecting end of theraceway member '15 so that the surface of the ball 14 may contact withthe concavedjsurface of the cam path13. It will be observed by aninspection of Fig.8 of the drawings that the center of the ball 14- islocated on one side ofthe axis of the stud 25*, while the roller 2'4; islocated on the opposite side of said axis.

This roller24 coacting with the periphery otthedisk 11 is intended toretain the ball 14.- at' all times in contact with its cam path 13. Thearm 35 extending upwardly from the lever 17 is provided with a splitring 36 in which is mounted the looper 37 secured therein by the clampscrew 38. The split ring 36 is pivoted to the end of the arm 35.

V by said screw 38 by which it may be clamped at any desired anglerelative. to the said arm 35.

As the needle 39 passes downwardly with its barb below the work support40, the rotation of the cam disk 11 will cause the looper 37 to be movedin an orbit about the needle 39 and place the thread carried by saidlooper upon the barb of the needle preparatory to its upward movementthrough the work.

The machine is provided with the shuttle 41 with a driving mechanismtherefor, and also has all the other instrumentalities for the formationof the stitch, but as these devices form no part of the presentinvention, they are not herein described.

The shaft 10 has mounted thereon a gear 42 which is driven by the gear43 on the main driving shaft 44. It is evident that the entire loopermechanism is supported from the'single bearing 26 and. that by thecombined operation of the various elements thereof the looper 37 isgiven the required orbital movement that is necessary to place theloopof thread upon the needle 39.

By mounting the ball 14 upon the smaller ball 16 in the member 15 andbetween the projections this ball is free to move in any direction whencoacting with either the peripheral throws 12 or the side throws 45 ofthe cam path 13, its free movement reducing the friction of theoperating and coacting parts to a minimum.

It will be noted that the shanks of the projections 30 are eccentric tothe bases thereof and are provided at their ends with slots by whichsaid projections may be turned about the axes of said shanks, therebyreducing the distance between the adjacent walls of said projections.When thus adjusted the projections are again locked in position by meansof the nuts 31. By this construction whenever the ball 14 becomes wornand reduced slightly in diam- V eter the projections may be adjusted totake the roller 24 is bearing against the periphery of the cam disk.\Vhile the ball 14 is passing over the peripheral cam throw 12 thespring 21 will be compressed in an obvious manner and will again expandas soon as said throw l2 has been passed It is believed that theoperation and many advantages of this invention will be fully understoodfrom the foregoing description.

Having thus described my invention, I claim:

1. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path; a pivoted lever providedwith a thin plate extension having therein an annular raceway; a. loopersecured to the end of said lever; a large ball in said raceway adaptedto coact with said cam path; and means carried by said lever on eachside of said extension for positioning said ball in said raceway.

2. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path; a pivoted lever providedwith an annular raceway having a plurality of antifriction members; alooper secured to the end of said lever; a large ball in said racewaymovable on said antifriction members and adapted to coact with said campath; and means carried by said lever on each side of said raceway forpositioning said ball therein.

3. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path; a pivoted lever providedwith a thin plate extension having therein an annular raceway; a loopersecured to the end of said lever; a large ball in said raceway adaptedto coact with said cam path; and a tapered projection from said lever oneach side of said extension for positioning said ball in said raceway.

4. In a looper mechanism for sewing machines, the combination of a.revoluble disk having a peripheral cam path; a pivoted lever providedwith a thin plate extension having therein an annular raceway; a loopersecured to the end of said lever; a large ball in said raceway adaptedto coact with said cam path; and means carried by said lever on eachside of said extension for positioning said ball in said raceway andterminating opposite the center of said ball.

5. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a pcripheral cam throw;an oscillating device provided with a roll coacting with the peripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two tapered projections thereon; alooper on the upper end of said lever; a ball revoluble between saidprojections and positioned within said cam path; and araceway for saidball carried by said lever and interposed between said projections. 1

6. In a. looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device provided with a roll coacting with the peripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two tapered projections thereon; alooper secured to the end of said lever; a ball revoluble between saidprojections with its center alined with the ends thereof andpositionedwithin said cam path; and a raceway for said ball carried by said leverand interposed between said projections.

7. In a looper mechanism for sewing machines the combination of arevoluble disk having a peripheral cam path and aperipheral cam throw;an oscillating device provided with a roll coacting with the pe ripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two removable projections thereon; alooper secured to the end of said lever; a ball revoluble between saidprojections and positioned within said cam path; and a raceway for saidball carried by said lever and interposed between aid projections.

8. In a looper mechanism for sewing machines the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device provided with an arm carrying a roll aeting withthe periphery of said disk and having a transverse slot therein; a leverpivotally mounted in said slot and having two parallel projectionsthereon; a looper secured to the end of said lever; a ball revolnblebetween said projections and posit oned within said cam path; and aremovable raceway for said ball carried by said lever and interposedbetween said projections.

9. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device provided with a roll coacting with the peripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two parallel projections thereon; alooper secured to the end of said lever; a ball revoluble between saidprojections and positioned within said cam path; a removable membersecured to said lever midway of said projections and having a concavedannular raceway; a plurality of small balls in said raceway; and a largeball positioned between said projections in the center of said racewayand adapted to coaet with said cam path.

10. In a looper mechanism for sewing machines, the combination or" arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device having two arms one ofwhich is provided with anannular raceway and two projections disposed equidistant from saidracevay on opposite sides thereof; a large ball in said raceway betweenand contacting with said projections, said ball being adapted to coa'ctwith said cam path; a pivoted arm carrying a roll engaging the peripheryof said cam disk; a spring between the other arm of said pivoted deviceand said pivoted arm; and a looper carried by said. oscillating device.

11. In a looper mechanism for sewing machines the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device provided with a roll coacting with the peripheryof said disk and having a transverse slot therein; a looper carryinglever pivot ally mounted in said slot and having two parallelprojections thereon; a ball revoluble between said projections andpositioned within said cam path; and a raceway for said ball carried bysaid lever and interposed between said projections.

12. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a poripheral cam throw;an oscillating device provided with a roll enacting with the peripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two parallel projections thereon; alooper at the upper end of said lever; a ball revoluble between saidprojections and positioned within said cam path; a raceway for said ballcarried by said lever and interposed between sa d projections; and aplurality of antitriction members in said raceway engaging said ball.

13. In a looper mechanism for sewing machines, the comb nation of arevoluble disk having a peripheral cam path and a periphe al cam throw:an oscillat ng device provided with a roll enacting with the peripheryof said disk and having a transverse slot therein; a lever pivotallymounted in said slot and having two parallel projections thereon; alooper at the upper end ot said lever; a ball revoluble between saidprojections and positioned within said cam path; a member secured tosaid lever midway of said projections and having a conca ed annularraceway; a plurality of small balls in said raceway; and a large ballpositi oned between said projections in the center of said raceway andadapted to eoact with said cam path.

1 In a looper mechanism for sewing ma chines, the combination of arevoluble disk having a peripheral cam ath and a peripheral cam throw;an oscillating device pro vided with a roll coaeting with the peripheryof said disk and having a transverse slot therein; a'lever pivotallymounted in said to the opposite end of said lever arm; and

slot and having two parallel projections thereon; a looper at the upperend of said lever; a ball revoluble between said projections andpositioned within said cam path; a member secured to said lever midwayof said projections and having a concaved annular raceway; a pluralityof small balls in said raceway; and. a large ball positioned betweensaid projections in the center oi: said raceway and adapted to coactwith said cam path, said projections terminating at the center of saidball. 7

15. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;an oscillating device having two arms extending in opposite directionfrom its pivot, one of said arms consisting of a lever mounted on apivot perpendicular to the axis of oscillation of said device;

means for separating the arms of said oscillatingdevice; a roll carriedby one arm and contacting with the periphery of said disk; a ballrevolubly mounted in the lever arm and positioned in said cam path; anda looper secured to the opposite end of said lever arm.

16. In a'looper mechanism for sewing chines, thecombination of arevoluble disk having a peripheral cam path anda peripheral cam throw;an oscillating device having two arms extending in opposite directionfrom its pivot, one of said arms consisting of a lever mounted on apivot perpendicular to the axis ofoscillation of said device; a rollercarried'by the other arm and contacting with the periphery of said disk;a ball revolubly mounted in the lever arm and positioned in said campath; a looper secured means whereby said roller arm may yield whilesaid ball is passing over said peripheral cam throw.

17. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a peripheral cam throw;a universally mounted device carrying a cam-path-engaging member; alooper secured to said device; and means on said device coacting withthe periphery of said disk and yieldingly connected to saidcam-path-engaging member for retaining said member in engagement withits cam path.

18. In a looper mechanism for sewing machines, the combination of arevoluble disk havinga peripheral cam path and a peripheral cam throw; auniversally mounted device carrying a cam-path-engaging member; a loopersecured to said device; means on said device coacting with the peripheryof said disk; and a resilient member between said co-acting means andsaid member for retaining said member in engagement with its cam pathand said means in contact with the periphery of said disk.

19. In a looper mechanism for sewing machines, the combination of arevoluble disk having a peripheral cam path and a periphe :11 cam throw;a universally mounted device carrying a looper; two eccentricallymounted tapered projections secured to said device and adapted to beadjusted about their axes; a member interposed between said projectionswith a raceway therein; and a ball in said raceway with its center insubstantial alinement with the ends of said projections.

Signed by me at l P. 0. Sq., Boston, Mass, this 22nd day of April, 1915.

EDIVARD ERICKSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, I). C.

